Stony Brook at Rt 20 at Waltham, MA

USGS Site No: 01104460 • Stony Brook • Middlesex County, MA

Stony Brook at Rt 20 at Waltham, MA on the Stony Brook is currently at 18 cfs (Normal — 28th percentile for this date) . Gage height: 5.15 ft.

Reading from

↑ Upstream on Stony Brook
Stony Brook at Viles Street, Near Weston, MA
18
CFS Discharge
5.15
Gage Height (ft)
Normal
Flow Condition
N/A
Flood Status

Historical Percentile Comparison

Today's discharge compared to the long-term record for June 11 at this station. Percentile rank shows what fraction of historical years had lower flow on this date.

Percentile Label CFS Threshold Today's Flow
10th Very Low threshold 11
25th Low threshold 17
50th (Median) Normal (median) 26 Today: 18 cfs
75th High threshold 40
95th Very High threshold 215

30-Day Hydrograph

Recent discharge plotted against the historical 10th–95th percentile envelope for the same calendar days. Source: USGS daily values + long-term statistics.

324 162 0 cfs Apr 6 May 28
10th–95th historical Day-of-year median Recent discharge

30-Day Flow History

Date Discharge (CFS) Gage Ht (ft)
May 28, 2026 20 —
May 27, 2026 21 —
May 26, 2026 23 —
May 25, 2026 24 —
May 24, 2026 20 —
May 23, 2026 18 —
May 22, 2026 20 —
May 21, 2026 21 —
May 20, 2026 26 —
May 19, 2026 17 —
May 18, 2026 16 —
May 17, 2026 16 —
May 16, 2026 16 —
May 15, 2026 17 —
Apr 21, 2026 20 —
Apr 20, 2026 22 —
Apr 19, 2026 23 —
Apr 18, 2026 25 —
Apr 17, 2026 28 —
Apr 16, 2026 30 —
Apr 15, 2026 25 —
Apr 14, 2026 22 —
Apr 13, 2026 21 —
Apr 12, 2026 21 —
Apr 11, 2026 22 —
Apr 10, 2026 23 —
Apr 9, 2026 24 —
Apr 8, 2026 26 —
Apr 7, 2026 27 —
Apr 6, 2026 29 —

Station Information

USGS Site No
01104460
State
MA
County
Middlesex County
Coordinates
42.3690, -71.2706
Drainage Area
22 mi²
Datum (ft)
89.2
HUC Code
01090001
View on USGS NWIS →

Recent Extremes

Max discharge
145 cfs
May 23, 2025
Min discharge
5 cfs
Jul 6, 2025

Computed from the local daily-values archive.

Nearby Gauges

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